docs: def format_v1_score_response(response, limit_to_model=None):
      """
      The response format looks like this::
  
          {
              "<rev_id>": {
                  "<model_name>": <score>
                  "<model_name>": <score>
              },
              "<rev_id>": {
                  "<model_name>": <score>
                  "<model_name>": <score>
              }
          }
      """
      response_doc = defaultdict(dict)
      for rev_id, rev_scores in response.scores.items():
          for model_name, score in rev_scores.items():
              response_doc[rev_id][model_name] = score
  
      for rev_id, rev_errors in response.errors.items():
          for model_name, error in rev_errors.items():
              response_doc[rev_id][model_name] = util.format_error(error)
  
      if limit_to_model is not None:
          return util.jsonify({rev_id: model_scores[limit_to_model]
                              for rev_id, model_scores in response_doc.items()})
      else:
          return util.jsonify(response_doc)